7874f1d718
Found by the toybox id(1) which calls both getpwuid(3) and getgrgid(3) before looking at either result. The use of a shared buffer in this code meant that even on a single thread, the data for any of the passwd functions would be clobbered by the data for any of the group functions (or vice versa). This might seem like an insufficient fix, but POSIX explicitly says (for getpwnam) that the result "might be overwritten by a subsequent call to getpwent(), getpwnam(), or getpwuid()" and likewise for other members of that group, plus equivalent text for the group-related functions. Change-Id: I2272f47e91f72e043fdaf7c169fa9f6978ff4370
122 lines
4.7 KiB
C++
122 lines
4.7 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef __BIONIC_PRIVATE_BIONIC_TLS_H_
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#define __BIONIC_PRIVATE_BIONIC_TLS_H_
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#include <sys/cdefs.h>
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#include <sys/limits.h>
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#include "bionic_macros.h"
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#include "__get_tls.h"
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__BEGIN_DECLS
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/** WARNING WARNING WARNING
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**
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** This header file is *NOT* part of the public Bionic ABI/API
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** and should not be used/included by user-serviceable parts of
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** the system (e.g. applications).
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**
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** It is only provided here for the benefit of the system dynamic
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** linker and the OpenGL sub-system (which needs to access the
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** pre-allocated slot directly for performance reason).
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**/
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// Well-known TLS slots. What data goes in which slot is arbitrary unless otherwise noted.
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enum {
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TLS_SLOT_SELF = 0, // The kernel requires this specific slot for x86.
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TLS_SLOT_THREAD_ID,
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TLS_SLOT_ERRNO,
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// These two aren't used by bionic itself, but allow the graphics code to
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// access TLS directly rather than using the pthread API.
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TLS_SLOT_OPENGL_API = 3,
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TLS_SLOT_OPENGL = 4,
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// This slot is only used to pass information from the dynamic linker to
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// libc.so when the C library is loaded in to memory. The C runtime init
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// function will then clear it. Since its use is extremely temporary,
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// we reuse an existing location that isn't needed during libc startup.
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TLS_SLOT_BIONIC_PREINIT = TLS_SLOT_OPENGL_API,
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TLS_SLOT_STACK_GUARD = 5, // GCC requires this specific slot for x86.
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TLS_SLOT_DLERROR,
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TLS_SLOT_FIRST_USER_SLOT // Must come last!
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};
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/*
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* There are two kinds of slot used internally by bionic --- there are the well-known slots
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* enumerated above, and then there are those that are allocated during startup by calls to
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* pthread_key_create; grep for GLOBAL_INIT_THREAD_LOCAL_BUFFER to find those. We need to manually
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* maintain that second number, but pthread_test will fail if we forget.
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* Following are current pthread keys used internally:
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* basename libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* dirname libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* uselocale libc
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* getmntent_mntent libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* getmntent_strings libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* ptsname libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* ttyname libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* strerror libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* strsignal libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* passwd libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* group libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
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* _res_key libc
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* je_thread_allocated_tsd jemalloc
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* je_arenas_tsd jemalloc
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* je_tcache_tsd jemalloc
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* je_tcache_enabled_tsd jemalloc
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* je_quarantine_tsd jemalloc
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*
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*/
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#define LIBC_TLS_RESERVED_SLOTS 12
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#if defined(USE_JEMALLOC)
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/* jemalloc uses 5 keys for itself. */
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#define BIONIC_TLS_RESERVED_SLOTS (LIBC_TLS_RESERVED_SLOTS + 5)
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#else
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#define BIONIC_TLS_RESERVED_SLOTS LIBC_TLS_RESERVED_SLOTS
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#endif
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/*
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* Maximum number of elements in the TLS array.
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* This includes space for pthread keys and our own internal slots.
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*/
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#define BIONIC_TLS_SLOTS (PTHREAD_KEYS_MAX + TLS_SLOT_FIRST_USER_SLOT + BIONIC_TLS_RESERVED_SLOTS)
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__END_DECLS
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#if defined(__cplusplus)
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class KernelArgumentBlock;
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extern __LIBC_HIDDEN__ void __libc_init_tls(KernelArgumentBlock& args);
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#endif
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#endif /* __BIONIC_PRIVATE_BIONIC_TLS_H_ */
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